This is an important question.

It has been observed that a short communication is for a concise, but independent report representing a significant contribution:

http://ejbiotechnology.ucv.cl/iaformato/short_communications.html

For example, short communications are the focus in

http://jeb.biologists.org/content/216/10/1757

https://www.elsevier.com/journals/the-veterinary-journal/1090-0233/guide-for-authors

https://www.elsevier.com/journals/journal-of-biomechanics/0021-9290/guide-for-authors

https://www.elsevier.com/journals/journal-of-research-in-personality/0092-6566/guide-for-authors

http://www.sciencedirect.com/science/journal/00219673/6

thank you so very much sir !